Episerver Commerce - Retrieving all parent catalog nodes

Update: Code sample updated to use GetCategories extension method, as suggested by Magnus Rahl in his comment.

Let say you have a product "Puma Green Suede Athletic Sneakers Shoes" with the following categories:

Here is code that lists all nodes (of type NodeContent) that the product belongs to:

private List<string> GetNodes(ProductContent currentContent)
{
   List<string> nodeList = new List<string>();
 
   foreach (var nodeRelation in currentContent.GetCategories())
   {
      var currentNode = _contentLoader.Get<NodeContent>(nodeRelation); 
      if (currentNode != null)
      {
         AddParentNodes(currentNode, nodeList);
      }
   }  

   return nodeList;
}

private void AddParentNodes(NodeContent currentNode, List<string> nodeList)
{
   if (currentNode == null)
   {
     return;
   }
 
   if (!nodeList.Contains(currentNode.Code))
   {
     nodeList.Add(currentNode.Code); 
   }
   var nodeRelations = currentNode.GetCategories().ToList();
   nodeRelations.Add(currentNode.ParentLink);

   foreach (var nodeRef in nodeRelations)
   {
     var node = _contentLoader.Get<CatalogContentBase>(nodeRef);
     AddParentNodes(node as NodeContent, nodeList);
   }
}

Hopefully this will be a lot cleaner in the next major version of Episerver Commerce